A shipyard facility where plates and profiles are cut and welded together. The assembly systems begin with plates and profiles being moved into a fabrication shop. The first step is usually the cutting of plates. Gas-oxygen flame or underwater plasma arc processes are used for cutting. Flame cut sections may need straightening. This can be done through multiple rolls. Panel line system provides welding flat plate panels, attaching stiffeners with automatic welding, and moving the panels along a line where webs and other steel members may be attached.